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Codeforces Round 940 (Div. 2) and CodeCraft-23
32:12:21
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Difficulty:
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brute force
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5818
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2668
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7147
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x801
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1514
1805A
We Need the Zero
bitmasks
,
brute force
800
x20766
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1352
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4400
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11441
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11952
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12066
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x762
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10772
1798E
Multitest Generator
brute force
,
dp
2300
x1487
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15816
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1174
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3671
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x165
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18515
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21095
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23194
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1262
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x370
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1295
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13101
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11364
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x26568
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3115
1790C
Premutation
brute force
,
implementation
,
math
1000
x22836
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x509
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x754
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1557
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15724
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x16775
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3693
1788A
One and Two
brute force
,
implementation
,
math
800
x27238
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x391
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8572
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x297
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14407
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2010
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4144
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1259
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5210
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x6986
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13179
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1361
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1293
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16435
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x129
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7607
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19281
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x358
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x631
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1015
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7369
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
1772B
Matrix Rotation
brute force
,
implementation
800
x28091
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x656
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2579
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8232
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x22806
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x115
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x186
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x365
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x926
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x853
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1307
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x825
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1119
1766A
Extremely Round
brute force
,
implementation
800
x23668
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x558
1765E
Exchange
brute force
,
math
1000
x9469
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x874
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6249
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13833
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
1761A
Two Permutations
brute force
,
constructive algorithms
800
x16683
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x9844
1759D
Make It Round
brute force
,
number theory
1400
x11954
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6821
1753F
Minecraft Series
brute force
,
two pointers
3500
x184
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x305
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x15927
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10369
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14148
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5221
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10142
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7246
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x25972
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9706
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21374
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1402
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17122
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1803
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x22367
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5251
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20679
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1355
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8206
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